Multipoint Mac Control Protocol; Dynamic Bandwidth Allocation - Alcatel-Lucent 7302 Information Manual

7 — EPON ONT overview
Standard
IEEE 802.11

Multipoint MAC control protocol

The EPON network allows only one ONT to transmit in the upstream direction at a
time. The MPCP located at the OLT times the transmissions of multiple ONTs.
MPCP reports traffic congestions, which optimizes the allocation of bandwidth
across the PON.
The MPCP comprises the following processing functions:
•
discovery processing
This function manages the discovery process of an ONT and compensates for
round trip time.
•
report processing
This function manages the generation and collection of report messages through
which bandwidth requests are sent upstream from the ONT to the OLT.
•
gate processing
This function manages the generation and collection of gate messages, through
which multiplexing of multiple transmitters is achieved.
In the discovery phase, each registered ONT is designated a unique LLID. The OLT
supports 64 LLIDs for each PON interface over EPON. For 10G EPON, the OLT
supports 128 LLIDs for each PON interface.

Dynamic bandwidth allocation

Dynamic bandwidth allocation (DBA) is the process by which an ONT requests
upstream bandwidth and whereby the OLT re-assigns bandwidth accordingly to
improve upstream bandwidth utilization and to guarantee service equality.
To process the bandwidth requests from the ONTs, ISAM monitors the queue status
of all LLIDs and reassigns upstream bandwidth accordingly.
The following bandwidth types are supported:
•
fixed bandwidth. The upstream bandwidth is reserved for the ONT so that the
OLT always sends a constant grant to the ONT even without an upstream request.
This bandwidth is not included in DBA scheduling.
•
assured bandwidth. The OLT sends the corresponding grant according to the
MPCP report message from the ONT. If the upstream request is less than the grant
assigned by the OLT, the surplus bandwidth can be used by other ONTs through
DBA.
•
best-effort bandwidth. The ONT can use the surplus bandwidth on the PON if
there are no bandwidth requests from services that have higher priority.
7-8 November 2013
Table 7-1 RSSI specifications
Description
A set of standards carrying out wireless local area network
(WLAN) computer communication in the 2.4, 3.6, and 5 GHz
frequency bands
Alcatel-Lucent 7302 ISAM | 7330 ISAM FTTN | 7360 ISAM FX ONT R04.06.02
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